CN108896337A - It is a kind of for testing the test macro and test method of new blower degerming performance - Google Patents
It is a kind of for testing the test macro and test method of new blower degerming performance Download PDFInfo
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- CN108896337A CN108896337A CN201810886765.8A CN201810886765A CN108896337A CN 108896337 A CN108896337 A CN 108896337A CN 201810886765 A CN201810886765 A CN 201810886765A CN 108896337 A CN108896337 A CN 108896337A
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- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 238000010998 test method Methods 0.000 title claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 44
- 238000005070 sampling Methods 0.000 claims description 50
- 230000003068 static effect Effects 0.000 claims description 29
- 238000004659 sterilization and disinfection Methods 0.000 claims description 22
- 230000001954 sterilising effect Effects 0.000 claims description 21
- 239000003344 environmental pollutant Substances 0.000 claims description 15
- 231100000719 pollutant Toxicity 0.000 claims description 15
- 241000894006 Bacteria Species 0.000 claims description 8
- 238000011045 prefiltration Methods 0.000 claims description 8
- 238000012258 culturing Methods 0.000 claims description 7
- 244000005700 microbiome Species 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 5
- 238000011109 contamination Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 68
- 230000001502 supplementing effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000000356 contaminant Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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- General Physics & Mathematics (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of for testing the test macro and test method of new blower degerming performance, including closed loop airflow line, the hair dryer being fixedly connected on the inside of closed loop airflow line, along closed loop airflow line and gas sampler and apparatus for measuring air quantity after gas sampler, new blower, filter before fairing that Hairdryer direction is set gradually, filter；Fairing is fixedly connected on the inside of closed loop airflow line；Gas sampler is mutually fixedly connected with closed loop airflow line after filtering preceding gas sampler and filter；The air inlet and air outlet of new blower are mutually fixedly connected with closed loop airflow line respectively and are connected with closed loop airflow line；Apparatus for measuring air quantity both ends are mutually fixedly connected with closed loop airflow line respectively and are connected with closed loop airflow line；Closed loop airflow line, new blower and apparatus for measuring air quantity constitute closed loop configuration；It the advantage is that, testing precision can be improved, reduce the discharge number and total release of polluted gas, reduce the pollution to atmospheric environment.
Description
Technical Field
The invention relates to the technical field of fresh air fan performance testing, in particular to a testing system and a testing method for testing the sterilization performance of a fresh air fan.
Background
The new fan is used for discharging indoor dirty air to the outdoor and introducing outdoor fresh air into indoor equipment, and a HEPA filter or a purifying device is arranged in the new fan, so that introduced air can be filtered, and pollutants in the fresh air entering the indoor are reduced. The pollutants are mainly classified into three types, namely particulate matters (PM2.5 and the like), chemical gases (formaldehyde, ozone and the like) and microorganisms (bacteria, mold and the like).
HEPA filter or purifier play decisive effect to new fan's wholeness ability, consequently in the test to new fan performance, mainly test new fan ability of polluting in the filtered air. At present, particulate matter and chemical gas testing methods in the industry are more and more mature, but the testing methods for microorganisms are few and incomplete. And the operation of microorganisms is complex, the environment is easy to be polluted, and the requirement on equipment is high.
Generally, in the test of the sterilization performance, a polluted gas (a gas mixed with bacteria or mold) is led to an air inlet of a fresh air fan, then the concentration of the polluted gas in the air at an air outlet of the fresh air fan is detected, and the sterilization efficiency is calculated according to the concentration difference. However, gas discharged from the air outlet of the fresh air blower is directly discharged into the atmosphere, so that environmental pollution is caused, meanwhile, the concentration of polluted gas in the gas introduced from the air inlet of the fresh air blower cannot be stably controlled, variable factors are more, and the testing accuracy is lower.
Disclosure of Invention
The invention aims to provide a test system and a test method for testing the sterilization performance of a fresh air fan, which have the advantages that the accuracy of the sterilization performance test of the fresh air fan can be improved, the test system can be conveniently cleaned and disinfected after the sterilization performance test, the emission times and the total emission of polluted gas are reduced, and the pollution to the environment is reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a test system for testing the sterilization performance of a fresh air fan comprises a closed-loop airflow pipeline, a blower fixedly connected to the inner side of the closed-loop airflow pipeline, a rectifying device, a pre-filter gas sampling pipe, the fresh air fan, a post-filter gas sampling pipe and an air volume measuring device, wherein the rectifying device, the pre-filter gas sampling pipe, the fresh air fan, the post-filter gas sampling pipe and the air volume measuring device are sequentially arranged along the closed-loop airflow pipeline and the blowing direction of; the rectifying device is fixedly connected to the inner side of the closed-loop airflow pipeline; the pre-filtering gas sampling pipe and the post-filtering gas sampling pipe are both fixedly connected with the closed-loop gas flow pipeline, one end of the pre-filtering gas sampling pipe and one end of the post-filtering gas sampling pipe extend into the inner side of the closed-loop gas flow pipeline, and the other end of the pre-filtering gas sampling pipe and the other end of the post-filtering gas sampling pipe are positioned; the air inlet and the air outlet of the fresh air fan are respectively and fixedly connected with the closed-loop airflow pipeline and communicated with the closed-loop airflow pipeline; two ends of the air quantity measuring device are respectively fixedly connected with the closed-loop airflow pipeline and communicated with the closed-loop airflow pipeline; the closed-loop airflow pipeline, the fresh air fan and the air volume measuring device form a closed-loop structure; the closed loop airflow pipeline is provided with a pollutant adding port between the blower and the rectifying device.
The invention is further configured to: the air quantity measuring device comprises a splicing pipeline, a rectifying device, a first static pressure ring and a flow regulating device, wherein the first static pressure ring and the rectifying device are respectively provided with a pair, the flow regulating device is positioned between the pair of first static pressure rings, and the pair of first static pressure rings are respectively positioned between the pair of rectifying devices.
The invention is further configured to: the flow regulating device comprises a fixing plate and a nozzle, and the nozzle is fixedly connected to one side of the fixing plate facing to the flow direction of the airflow in the closed-loop airflow pipeline; the fixed plate is fixedly connected with the inner wall of the splicing pipeline, and the spaces on two sides of the fixed plate are communicated through the nozzle.
The invention is further configured to: the rectifying device is a rectifying plate; the testing system further comprises a first valve connected with the closed-loop airflow pipeline to control the closed-loop airflow pipeline to be opened or closed, and the first valve is located between an air inlet of the fresh air fan and the blower.
The invention is further configured to: and a second static pressure ring is fixedly connected to the outer side of the end part of the closed-loop airflow pipeline close to the fresh air machine.
The invention is further configured to: the test system further comprises an air inlet filtering device which is fixedly connected to the inner side of the closed-loop airflow pipeline and located between the air volume measuring device and the air blower.
The invention is further configured to: the test system also comprises an exhaust fan which is fixedly connected to the inner side of the closed-loop airflow pipeline and is positioned between the air inlet filtering device and the air quantity measuring device; an anemometer is arranged between the first valve and the pollutant adding port of the closed-loop airflow pipeline.
The invention is further configured to: the test system further comprises an air outlet filtering device, wherein the air outlet filtering device is fixedly connected to the inner side of the closed-loop airflow pipeline and is located between the exhaust fan and the air volume measuring device.
The invention is further configured to: the testing system further comprises a pressure supplementing port which is arranged on the closed-loop airflow pipeline in a supplementing mode, and the pressure supplementing port is located between the air blower and the air volume measuring device.
The test method for testing the performance of the fresh air fan comprises the following steps:
s1: before the new fan is detected, whether the package is intact is checked, the package is dismantled before the test is started, the test operation is carried out for at least 1h under the test environment, and then the new fan is installed in the closed-loop airflow pipeline;
s2: before the test is started, the test system is operated for 30min under the maximum air quantity of the fresh air fan so as to purify the background environment and microorganisms inside the fresh air fan;
s3: starting a spray contamination device, stabilizing for 1min, simultaneously starting a pre-filter gas sampling tube and a post-filter gas sampling tube, sampling for 1-5 min, and carrying out continuous sampling for three times at each sampling position;
s4: after the test is finished, closing the test system, introducing ozone with the concentration of not less than 20mg/m3 from the pollutant adding port, standing for at least 60min, starting the test system, exhausting air for 10min, closing the test system, and finishing the test;
s5: putting the sampled plate into an incubator as soon as possible for culturing, culturing bacteria at the temperature of 24-48 h, and culturing mould at the temperature of 3-5 d.
The invention has the following advantages:
1. the flow regulating device can regulate the air pressure at two ends of the fresh air fan and can rectify the air flow, so that the air flow at the air inflow end and the air outflow end of the fresh air fan is more stable, the air pressure can be stably regulated, the interference of the turbulence of the air flow on a test result is reduced, and the accuracy of the test result is improved;
2. when the air pressure at the two ends of the fresh air fan in the closed-loop airflow pipeline cannot reach the set pressure value, the air can be supplemented into the closed-loop airflow pipeline through the pressure supplementing port to achieve the pressure supplementing effect, so that the air pressure at the two ends of the fresh air fan can be stably kept at the set value, the interference of the pressure change on the test result is reduced, and the accuracy of the test result is improved;
3. the second static pressure ring has the function of detecting whether the connection between the variable diameter pipeline and the new fan and between the variable diameter pipeline and the closed loop airflow pipeline is normal or not, so that the influence of air leakage between the variable diameter pipeline and the new fan and between the variable diameter pipeline and the closed loop airflow pipeline on a test result is reduced, and the test accuracy is improved;
4. the built-in anemometer can monitor whether a pipeline system is normal or not and whether air flows smoothly or not at any time;
5. closed loop airflow pipeline is in the testing process, and whole degerming ability testing process and life-span testing process go on under isolated outside air's environment, and inside polluted gas recycles, and reducible polluted gas discharges to outside atmosphere, reduces the pollution to atmospheric environment, reduces the interference of outside air to the test result, improves the degree of accuracy of test result.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
fig. 4 is a schematic view showing the structure of the flow rate adjustment device in embodiment 1.
Wherein,
1. a closed loop gas flow conduit; 11. pressure supplementing ports; 12. a contaminant addition port; 13. a discharge port; 14. an air inlet;
2. a blower;
3. a rectifying plate a; 31. a through hole;
4. a pre-filter gas sampling tube;
5. a fresh air machine;
6. a filtered gas sampling tube;
7. an air volume measuring device; 71. splicing the pipelines; 72. a flow regulating device; 721. a fixing plate; 722. a nozzle; 73. a first static pressure ring; 74. an operation port;
8. an air outlet filtering device;
9. an intake air filtering device;
101. a variable diameter pipeline;
102. a second static pressure ring;
103. an exhaust fan;
104. a rectifying plate b; 1041. air holes;
105. a first valve;
106. a second valve;
107. an exhaust fan;
108. an anemometer.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
A test system for testing the sterilization performance of a fresh air fan is shown in figure 1 and comprises a closed-loop airflow pipeline 1, a blower 2, a rectifying device, a pre-filtering gas sampling pipe 4, a fresh air fan 5, a post-filtering gas sampling pipe 6 and an airflow measuring device 7, wherein the blower 2 is used for driving airflow in the closed-loop airflow pipeline 1 to circularly flow.
Fairing, gas sampling pipe 4 before straining, new fan 5, gas sampling pipe 6 after straining and air flow measuring device 7 set gradually along the air current flow direction, and the equal fixed connection of fairing is inboard at closed loop airflow pipeline 1. The pre-filtering gas sampling pipe 4 and the post-filtering gas sampling pipe 6 are respectively fixedly connected with the closed-loop gas flow pipeline 1, one end of the pre-filtering gas sampling pipe and one end of the post-filtering gas sampling pipe are ingested into the closed-loop gas flow pipeline 1, and the other end of the pre-filtering gas sampling pipe and the other end of the post-filtering gas sampling pipe are located outside the. The air inlet and the air outlet of the fresh air machine 5 are respectively and fixedly communicated between the closed-loop airflow pipelines 1.
Closed loop airflow pipeline 1 offers between hair-dryer 2 and fairing and is used for letting in the pollutant of polluted gas (bacterium, PM2.5, harmful gas etc.) and adds mouth 12 in to closed loop airflow pipeline 1, in operation, continuously add mouth 12 and let in the polluted gas in to closed loop airflow pipeline 1 through the pollutant, the polluted gas flows along closed loop airflow pipeline 1 along with the air current that hair-dryer 2 produced, fairing can adjust so that the air current flows more steadily to the air current, the air current is behind fairing, gas sampling pipe 4 carries out the sampling analysis to the gas in the air current before filtering, detect out the concentration of polluted gas in the air current. After the air flow passes through the fresh air fan 5, the filtered gas sampling pipe 6 samples and analyzes the gas in the air flow, the concentration of the polluted gas in the air flow is detected, the concentration of the polluted gas in the air flow before being filtered by the fresh air fan 5 is compared with the concentration of the polluted gas in the air flow after being filtered by the fresh air fan 5, and the sterilization capability of the fresh air fan 5 can be obtained.
The air quantity measuring device 7 can adjust the air pressure in the closed-loop airflow pipeline 1 so as to keep the air pressure at the airflow inflow end and the air pressure at the airflow outflow end of the new fan 5 at stable set values, and the testing process is convenient to carry out.
With reference to fig. 2, the rectifying device adopts a rectifying plate a3, through holes 31 are uniformly distributed on the rectifying plate a3, airflow can be uniformly dispersed after passing through the through holes 31, and the speed and direction of the airflow passing through each through hole 31 are kept the same, so that the flowing stability of the airflow is improved.
As shown in fig. 1, the air volume measuring device 7 includes a splicing pipeline 71, a pair of rectifying plates b104 and a flow adjusting device 72 that are respectively fixedly connected to the inner wall of the splicing pipeline 71, and a pair of first static pressure rings 73 that are fixedly connected to the outer side of the splicing pipeline 71, the flow adjusting device 72 is located between the pair of first static pressure rings 73, the pair of first static pressure rings 73 are both located between the pair of rectifying plates b104, two ends of the splicing pipeline 71 are respectively fixedly connected to the closed-loop airflow pipeline 1, and the closed-loop airflow pipeline 1, the new fan 5 and the splicing pipeline 71 form a closed-loop channel structure.
Referring to fig. 3, the air holes 1041 are uniformly distributed on the rectifying plate b104, and the rectifying plate b104 can adjust the air flow entering the splicing pipeline 71 and flowing out of the splicing pipeline 71, so that the air flow is more stable.
As shown in fig. 1, the flow rate adjusting device 72 includes a fixing plate 721 and a nozzle 722, the fixing plate 721 is fixedly connected to the inner wall of the spliced pipe 71, the nozzle 722 is fixedly connected to one side of the fixing plate 721 facing the flow direction of the air flow, the spaces at both sides of the fixing plate 721 are mutually communicated through the nozzle 722, referring to fig. 4, the air vent of the nozzle 722 is tapered, the inner diameter of the nozzle 722 is gradually reduced along the flow direction of the air flow, the spliced pipe 71 is provided with an operation port 74, the operation port 74 is in a sealed closed state when the test system operates, the air pressure on both sides of the flow regulator 72 can be detected by the first static pressure rings 73 on both sides of the flow regulator 72, the nozzle 722 can be replaced after the operation opening 74 is opened, the gas flow rate through the nozzle 722 can be adjusted by replacing the nozzle 722 of a different size, so that the gas pressure on both sides of the flow rate adjusting device 72 can be stably maintained at the set pressure value.
As shown in fig. 1, an air outlet filtering device 8, an exhaust fan 103 and an air inlet filtering device 9 are further sequentially arranged inside the closed-loop airflow pipeline 1 and along the airflow flowing direction, and the air outlet filtering device 8 can filter out residual pollutant gas in the airflow filtered by the fresh air fan 5 so as to prevent the pollutant gas from polluting the exhaust fan 103 and reduce the interference of the residual pollutant gas on the test result.
The closed-loop airflow pipeline 1 is provided with a pressure compensating port 11 between the exhaust fan 103 and the air inlet filtering device, and the pressure compensating port 11 is used for compensating air into the closed-loop airflow pipeline 1 so as to adjust the air pressure in the closed-loop airflow pipeline 1 and keep the air pressure at two ends of the fresh air fan 5 at a stable set value; a discharge port 13 is connected between the air inlet filtering device 9 and the pressure compensating port 11 of the closed-loop airflow pipeline 1; the closed loop airflow pipeline 1 is connected with an air inlet 14 between the blower 2 and the filtering device 9, and the air inlet 14 and the discharge port 13 are in a closed state in the test process; the closed loop airflow pipeline 1 is provided with a second valve 106 between the filtering device 9 and the air inlet 14, and the second valve 106 is in an open state in the testing process; an exhaust fan 107 is provided in the exhaust port 13. Before the test is started and after the test is finished and after ozone disinfection is carried out, the air inlet 14 and the exhaust port 13 are opened, the exhaust fan 107 is started and exhausts air to the outside of the system through the exhaust port 13, and meanwhile, the second valve 106 is closed, and the inside of the closed-loop airflow pipeline 1 is ventilated.
The air inlet filtering device 9 is used for filtering impurities and bacteria carried in the pressure supplementing gas, and interference of the impurities in the pressure supplementing gas on a test result is reduced. The air outlet filtering device 8 and the air inlet filtering device 9 both adopt HEPA filter screens and can also adopt other filtering pieces.
The reducing pipelines 101 are fixedly connected between the two ends of the fresh air fan 5 and the closed-loop airflow pipeline 1, the fresh air fan 5 is communicated with the closed-loop airflow pipeline 1 through the reducing pipelines 101, the inner diameter of one end, close to the fresh air fan 5, of each reducing pipeline 101 is smaller than that of the other end of each reducing pipeline 101, and each reducing pipeline 101 is in a circular truncated cone shape.
The closed-loop airflow pipeline 1 is fixedly connected with a second static pressure ring 102 on the outer side of the end part close to the reducing pipeline 101, and the second static pressure ring 102 is used for detecting the airflow pressure entering the reducing pipeline 101 and flowing out of the reducing pipeline 101. The closed loop airflow duct is connected with a first valve 105 between the droop panel 3 and the blower 2, and the first valve 105 is used to open or close the closed loop airflow duct. When the new air blower 5 needs to be detected whether to be installed correctly, an air supply system of the new air blower 5 is opened, a first valve 105 is closed, a static pressure value of an air inlet of the new air blower 5 is detected through a second static pressure ring 102 at the air inlet of the new air blower 5, if the static pressure value is 60Pa, the installation is correct, otherwise, manual inspection and adjustment are needed; and opening the first valve 105, blocking the nozzle 722, detecting the static pressure value of the air outlet of the fresh air machine 5 through the second static pressure ring 102 at the air outlet of the fresh air machine 5, if the static pressure value is 200Pa, installing correctly, otherwise, manually checking and adjusting.
When the air pressure difference between the air inlet and the air outlet of the new air blower 5 is not kept at the set air pressure difference, the air pressure difference can be adjusted by supplementing pressure through the pressure supplementing port 11, adjusting the air speed of the air blower 2, adjusting the air speed of the exhaust fan 103 and replacing the nozzle 722, so that the air pressure difference between the two ends of the new air blower 5 keeps a stable set difference.
At intervals, the filtered gas sampling pipe 6 is used for detecting the concentration of the polluted gas in the airflow filtered by the fresh air fan 5 once, the descending speed of the sterilization capability of the fresh air fan 5 along with the service life attenuation can be detected, and the service life of the fresh air fan 5 (namely the time tested when the sterilization capability is lower than the lowest sterilization capability) can be calculated after long-time testing.
The above mentioned static pressure ring has the following specific structure: the end part of the closed-loop airflow pipeline 1, which is close to the fresh air fan 5, is about 150mm away from the air opening, the four surfaces of the closed-loop airflow pipeline 1, which are uniformly distributed along the axial direction of the center, are perforated to serve as pressure taking openings, then the four pressure taking holes are connected by using plastic hoses to form a static pressure ring, and a plastic pipe is additionally led to the static pressure ring to be connected with a pressure gauge, so that the external static pressure of the closed-loop airflow pipeline 1 can be measured.
The closed loop gas flow duct 1 is provided with an anemometer 108 between the first valve 105 and the pollutant addition port 12, the anemometer 108 being adapted to detect the gas flow rate inside the closed loop gas flow duct 1.
The term "fixedly connected" as used herein means fixedly connected and connected to each other, and the "polluted gas" is a mixed gas of microorganisms or bacteria and air.
Example 2
A test method for testing the performance of a fresh air fan comprises the following steps:
s1: before the new fan 5 is detected, whether the package is intact is checked, the package is dismantled before the test is started, the test operation is carried out for at least 1h in the test environment, and then the new fan 5 is installed in the closed-loop airflow pipeline 1;
s2: before the test is started, the test system is operated for 30min under the maximum air quantity of the new fan 5 so as to purify the background environment and microorganisms in the new fan 5;
s3: starting the spray contamination device, stabilizing for 1min, simultaneously starting the pre-filter gas sampling tube 4 and the post-filter gas sampling tube 6, sampling for 1-5 min, and carrying out continuous three-time sampling at each sampling position;
s4: after the test is finished, closing the test system, introducing ozone with the concentration of not less than 20mg/m3 from the pollutant adding port 12, standing for at least 60min, starting the test system, exhausting air for 10min, closing the test system, and finishing the test;
s5: putting the sampled plate into an incubator as soon as possible for culturing, culturing bacteria at 36 +/-1 ℃ for 24-48 h, and culturing mould at 28 +/-1 ℃ for 3-5 d.
Here, upstream refers to a position near the front of the contaminant addition port 12 in the counterclockwise direction in fig. 1, and downstream refers to a position near the rear of the pressure compensating port 11 in the counterclockwise direction in fig. 1.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The utility model provides a test system for testing new fan degerming performance, characterized by: the device comprises a closed-loop airflow pipeline (1), a blower (2) fixedly connected to the inner side of the closed-loop airflow pipeline (1), a rectifying device, a pre-filter gas sampling pipe (4), a fresh air fan (5), a post-filter gas sampling pipe (6) and an air quantity measuring device (7), wherein the rectifying device, the pre-filter gas sampling pipe, the fresh air fan (5), the post-filter gas sampling pipe and the air quantity measuring device are sequentially arranged along the closed-loop airflow pipeline (1) and along the blowing;
the rectifying device is fixedly connected to the inner side of the closed-loop airflow pipeline (1);
the pre-filtering gas sampling pipe (4) and the post-filtering gas sampling pipe (6) are fixedly connected with the closed-loop gas flow pipeline (1), one end of the pre-filtering gas sampling pipe extends into the inner side of the closed-loop gas flow pipeline (1), and the other end of the pre-filtering gas sampling pipe and the other end of the post-filtering gas sampling pipe are positioned on the outer side of the closed-loop gas flow pipeline (1);
an air inlet and an air outlet of the fresh air fan (5) are respectively and fixedly connected with the closed-loop airflow pipeline (1) and communicated with the closed-loop airflow pipeline (1);
two ends of the air quantity measuring device (7) are respectively fixedly connected with the closed-loop airflow pipeline (1) and communicated with the closed-loop airflow pipeline (1);
the closed-loop airflow pipeline (1), the fresh air fan (5) and the air quantity measuring device (7) form a closed-loop structure;
the closed loop airflow pipeline (1) is provided with a pollutant adding port (12) between the blower (2) and the rectifying device.
2. The test system for testing the sterilization performance of the new fan according to claim 1, wherein: air volume measuring device (7) are including concatenation pipeline (71), fairing, first static clamping ring (73) and flow regulation device (72), and first static clamping ring (73) and fairing all have a pair ofly, and flow regulation device (72) are located between a pair of first static clamping ring (73), and a pair of first static clamping ring (73) all are located between a pair of fairing.
3. The test system for testing the sterilization performance of the new fan according to claim 2, wherein:
the flow regulating device (72) comprises a fixing plate (721) and a nozzle (722), and the nozzle (722) is fixedly connected to one side of the fixing plate (721) facing to the airflow direction in the closed-loop airflow pipeline (1);
the fixed plate (721) is fixedly connected with the inner wall of the splicing pipeline (71), and the spaces on two sides of the fixed plate (721) are communicated through a nozzle (722).
4. The test system for testing the sterilization performance of the new fan according to claim 1 or 2, wherein: the rectifying device is a rectifying plate; the test system further comprises a first valve (105) connected with the closed-loop airflow pipeline (1) to control the closed-loop airflow pipeline (1) to be opened or closed, wherein the first valve (105) is positioned between an air inlet of the fresh air fan (5) and the air blower (5).
5. The test system for testing the sterilization performance of the new fan according to claim 1, wherein: and a second static pressure ring (102) is fixedly connected to the outer side of the end part of the closed-loop airflow pipeline (1) close to the fresh air fan (5).
6. The test system for testing the sterilization performance of the new fan according to claim 1, wherein: the test system further comprises an air inlet filtering device (9), wherein the air inlet filtering device (9) is fixedly connected to the inner side of the closed-loop airflow pipeline (1) and is located between the air volume measuring device (7) and the air blower (2).
7. The test system for testing the sterilization performance of the new fan according to claim 6, wherein: the test system further comprises an exhaust fan (103), wherein the exhaust fan (103) is fixedly connected to the inner side of the closed-loop airflow pipeline (1) and is located between the air inlet filtering device (9) and the air volume measuring device (7).
8. The test system for testing the sterilization performance of the new fan according to claim 7, wherein: the test system further comprises an air outlet filtering device (8), wherein the air outlet filtering device (8) is fixedly connected to the inner side of the closed-loop airflow pipeline (1) and is located between the exhaust fan (103) and the air volume measuring device (7).
9. The test system for testing the sterilization performance of the new fan according to claim 4, wherein: the testing system also comprises a pressure compensating port (11) arranged on the closed-loop airflow pipeline (1), and the pressure compensating port (11) is positioned between the blower (2) and the air volume measuring device (7); an anemometer (108) is arranged between the first valve (105) and the pollutant adding port (12) in the closed-loop airflow pipeline (1).
10. The test method for testing the performance of the fresh air fan is characterized by comprising the following steps of:
s1: before the fresh air fan (5) is detected, whether the package is intact is checked, the package is dismantled before the test is started, the test operation is carried out for at least 1h under the test environment, and then the fresh air fan (5) is installed in the closed-loop airflow pipeline (1);
s2: before the test is started, the test system is operated for 30min under the maximum air quantity of the new fan (5) so as to purify the background environment and microorganisms in the new fan (5);
s3: starting a spray contamination device, stabilizing for 1min, simultaneously starting a pre-filter gas sampling tube (4) and a post-filter gas sampling tube (6), sampling for 1-5 min, and carrying out continuous three-time sampling at each sampling position;
s4: after the test is finished, closing the test system, introducing ozone with the concentration not lower than 20mg/m3 from the pollutant adding port (12), standing for at least 60min, opening the test system, exhausting air for 10min, closing the test system, and finishing the test;
s5: and putting the sampled plate into an incubator as soon as possible for culturing, wherein bacteria are cultured for 24-48 h at the temperature of (36 +/-1) DEG C, and mould is cultured for 3-5 d at the temperature of (28 +/-1) DEG C.
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